#region Copyright (c) 2006-2009 Widgetsphere LLC, All Rights Reserved
//--------------------------------------------------------------------- *
//                          Widgetsphere  LLC                           *
//             Copyright (c) 2006-2009 All Rights reserved              *
//                                                                      *
//                                                                      *
//This file and its contents are protected by United States and         *
//International copyright laws.  Unauthorized reproduction and/or       *
//distribution of all or any portion of the code contained herein       *
//is strictly prohibited and will result in severe civil and criminal   *
//penalties.  Any violations of this copyright will be prosecuted       *
//to the fullest extent possible under law.                             *
//                                                                      *
//THE SOURCE CODE CONTAINED HEREIN AND IN RELATED FILES IS PROVIDED     *
//TO THE REGISTERED DEVELOPER FOR THE PURPOSES OF EDUCATION AND         *
//TROUBLESHOOTING. UNDER NO CIRCUMSTANCES MAY ANY PORTION OF THE SOURCE *
//CODE BE DISTRIBUTED, DISCLOSED OR OTHERWISE MADE AVAILABLE TO ANY     *
//THIRD PARTY WITHOUT THE EXPRESS WRITTEN CONSENT OF WIDGETSPHERE LLC   *
//                                                                      *
//UNDER NO CIRCUMSTANCES MAY THE SOURCE CODE BE USED IN WHOLE OR IN     *
//PART, AS THE BASIS FOR CREATING A PRODUCT THAT PROVIDES THE SAME, OR  *
//SUBSTANTIALLY THE SAME, FUNCTIONALITY AS ANY WIDGETSPHERE PRODUCT.    *
//                                                                      *
//THE REGISTERED DEVELOPER ACKNOWLEDGES THAT THIS SOURCE CODE           *
//CONTAINS VALUABLE AND PROPRIETARY TRADE SECRETS OF WIDGETSPHERE,      *
//INC.  THE REGISTERED DEVELOPER AGREES TO EXPEND EVERY EFFORT TO       *
//INSURE ITS CONFIDENTIALITY.                                           *
//                                                                      *
//THE END USER LICENSE AGREEMENT (EULA) ACCOMPANYING THE PRODUCT        *
//PERMITS THE REGISTERED DEVELOPER TO REDISTRIBUTE THE PRODUCT IN       *
//EXECUTABLE FORM ONLY IN SUPPORT OF APPLICATIONS WRITTEN USING         *
//THE PRODUCT.  IT DOES NOT PROVIDE ANY RIGHTS REGARDING THE            *
//SOURCE CODE CONTAINED HEREIN.                                         *
//                                                                      *
//THIS COPYRIGHT NOTICE MAY NOT BE REMOVED FROM THIS FILE.              *
//--------------------------------------------------------------------- *
#endregion
using System;
using System.Security.Cryptography;


namespace Widgetsphere.Generator.Common.Util
{
	public enum CryptographyAlgorithm 
	{
		Des,
		Rc2,
		Rijndael, 
		TripleDes
	}

	public sealed class CryptoFactory
	{
		private CryptoFactory(){}

		#region Public Create Methods

		public static ICryptoHelper Create(CryptographyAlgorithm algorithm)
		{
			switch(algorithm)
			{
				case CryptographyAlgorithm.Des:
				case CryptographyAlgorithm.Rc2:
				case CryptographyAlgorithm.Rijndael:
				case CryptographyAlgorithm.TripleDes:
					return new SymmetricCryptographyHelper(algorithm);
				default:
				{
					throw new CryptographicException("Algorithm '" + 
						algorithm + 
						"' not supported.");
				}
			}
			
		}

		public static ICryptoHelper Create(CryptographyAlgorithm algorithm, string entropy)
		{
			switch(algorithm)
			{
				case CryptographyAlgorithm.Des:
				case CryptographyAlgorithm.Rc2:
				case CryptographyAlgorithm.Rijndael:
				case CryptographyAlgorithm.TripleDes:
					return new SymmetricCryptographyHelper(algorithm, entropy);
				default:
				{
					throw new CryptographicException("Algorithm '" + 
						algorithm + 
						"' not supported.");
				}
			}
		}

		public static ICryptoHelper Create(string algorithmName, string entropy)
		{
			CryptographyAlgorithm algorithm = (CryptographyAlgorithm)System.Enum.Parse(typeof(CryptographyAlgorithm), algorithmName, true);
			return Create(algorithm, entropy);
		}

		#endregion

	}
}

#if UNITTEST
namespace Widgetsphere.Generator.Common.Util.UnitTest
{
	using NUnit.Framework;	
	
	[TestFixture] 
	public class CryptoFactoryTester
	{
		private const string ENCRYPTION_TEST_STRING = "Help;Me;To;Encrypt;SomethingValueable";
		private const string ENCRYPTION_VALID_PASSWORD = "Password";
		private const string ENCRYPTION_INVALID_PASSWORD = "Password2";
		
		[Test]
		public void RijndaelEncrypt()
		{
			ICryptoHelper crytographyHelper = CryptoFactory.Create(CryptographyAlgorithm.Rijndael);
			crytographyHelper.Entropy = ENCRYPTION_VALID_PASSWORD;
			string encryptedString = crytographyHelper.Encrypt(ENCRYPTION_TEST_STRING, StringEncodingType.Hex);
			Assert.IsFalse(StringHelper.Match(encryptedString,ENCRYPTION_TEST_STRING,true), "Encrypted String Equals String Passed In");

		}

		[Test]
		[ExpectedException(typeof(System.Security.Cryptography.CryptographicException))]
		public void RijndaelDecryptInvalidPassword()
		{
			ICryptoHelper crytographyHelper = CryptoFactory.Create(CryptographyAlgorithm.Rijndael);
			crytographyHelper.Entropy = ENCRYPTION_VALID_PASSWORD;
			string encryptedString = crytographyHelper.Encrypt(ENCRYPTION_TEST_STRING, StringEncodingType.Hex);

			ICryptoHelper crytographyHelper2 = CryptoFactory.Create(CryptographyAlgorithm.Rijndael);
			crytographyHelper2.Entropy = ENCRYPTION_INVALID_PASSWORD;
			string decriptedString = crytographyHelper2.Decrypt(encryptedString,StringEncodingType.Hex);

			Assert.AreEqual(ENCRYPTION_TEST_STRING, decriptedString);
		}

		[Test]
		public void RijndaelDecryptValidPassword()
		{
			ICryptoHelper crytographyHelper = CryptoFactory.Create(CryptographyAlgorithm.Rijndael);
			crytographyHelper.Entropy = ENCRYPTION_VALID_PASSWORD;
			string encryptedString = crytographyHelper.Encrypt(ENCRYPTION_TEST_STRING, StringEncodingType.Hex);

			ICryptoHelper crytographyHelper2 = CryptoFactory.Create(CryptographyAlgorithm.Rijndael);
			crytographyHelper2.Entropy = ENCRYPTION_VALID_PASSWORD;
			string decriptedString = crytographyHelper2.Decrypt(encryptedString,StringEncodingType.Hex);

            Assert.AreEqual(ENCRYPTION_TEST_STRING, decriptedString);
		}

	}
}
#endif
